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  • Hornsea Project Three Offshore Wind Farm

    Hornsea Project Three

    Offshore Wind Farm

    Appendix 26 to Deadline 9 submission - Safety Justification for Single Line of Orientation Layout

    Date: 26th March 2019

  • Safety Justification for Single Line of Orientation Layout March 2019

    i

    Document Control

    Document Properties

    Organisation Ørsted Hornsea Project Three

    Author Anatec

    Checked by Karma Leyland

    Approved by Andrew Guyton

    Title Safety Justification for Single Line of Orientation Layout

    PINS Document Number

    n/a

    Version History

    Date Version Status Description / Changes

    18.03.2019 A Draft Compilation of NRA and Examination Submissions Supporting a Single Line of Orientation.

    26/03/2019 B FINAL Compilation of NRA and Examination Submissions Supporting a Single Line of Orientation submitted at Deadline 9

    Ørsted

    5 Howick Place,

    London, SW1P 1WG

    © Orsted Power (UK) Ltd, 2019. All rights reserved

    Front cover picture: Kite surfer near a UK offshore wind farm © Ørsted Hornsea Project Three (UK) Ltd., 2019.

  • Safety Justification for Single Line of Orientation Layout March 2019

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    Table of Contents

    1. Introduction ................................................................................................................................................. 1

    Background ..................................................................................................................................................... 1

    Purpose of this Report .................................................................................................................................... 1

    2. Project Details ............................................................................................................................................ 1

    3. Guidance .................................................................................................................................................... 3

    4. Consultation ............................................................................................................................................... 3

    Maritime and Coastguard Agency ................................................................................................................... 3

    Trinity House ................................................................................................................................................... 4

    Cruising Association ....................................................................................................................................... 4

    Royal Yachting Association ............................................................................................................................ 4

    Regular Operators .......................................................................................................................................... 5

    5. Vessel Traffic .............................................................................................................................................. 6

    Data Overview ................................................................................................................................................ 6

    Traffic Density at Hornsea Developments ....................................................................................................... 9

    Anchoring Activity within Array Area ............................................................................................................. 10

    Traffic Behaviour Internally within Existing Arrays ........................................................................................ 10

    6. Search and Rescue .................................................................................................................................. 12

    Mark Prior Bio ............................................................................................................................................... 13

    Search and Rescue Access Lanes ............................................................................................................... 13

    Lack of Precedent ......................................................................................................................................... 13

    Turning Within the Array ............................................................................................................................... 13

    Minimum Spacing ......................................................................................................................................... 15

    7. Historical Incidents ................................................................................................................................... 15

    8. Other Evidence ......................................................................................................................................... 20

    Mitigation Measures – Pre Submission ......................................................................................................... 20

    Mitigation Measures – Post Submission ....................................................................................................... 21

    SOLAS Obligations ....................................................................................................................................... 22

    Hornsea Three as a Standalone Development ............................................................................................. 22

    Internal Allision Risk Impact from Navigational Risk Assessment ................................................................. 23

    9. Other Constraints ..................................................................................................................................... 31

    10. Summary and Conclusion ........................................................................................................................ 32

    11. References ............................................................................................................................................... 34

    List of Tables

    Table 2.1 Key project parameters ................................................................................................................ 2 Table 5.1: Traffic density within each Hornsea development array area ....................................................... 9

  • Safety Justification for Single Line of Orientation Layout March 2019

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    Table 6.1: EASA Part SERA recommended speeds ................................................................................... 14 Table 6.2 Minimum spacing at UK offshore wind farm developments ........................................................ 15 Table 6.3: Summary of historical collision and allision incidents involving wind farm sites ......................... 18 Table 7.1: Effects associated with navigation internally within the Hornsea Three array area .................... 29

    List of Figures

    Figure 2.1 Overview of NRA layout ............................................................................................................... 2 Figure 5.1 Overview of vessel traffic data within 10 nm of Hornsea Three array area (40 days summer and

    winter 2016) ................................................................................................................................. 7 Figure 5.2 Recreational vessels within 10 nm of Hornsea Three array area (40 days summer and winter) .. 8

    Figure 5.3 Fishing vessels within 10 nm of Hornsea Three array area (40 days summer and winter) .......... 9 Figure 5.4: AIS recreational vessels within London Array site boundary (Mar 2016 to Feb 2017) ............... 11 Figure 5.5: AIS fishing vessels within London Array site boundary (Mar 2016 to Feb 2017) ........................ 12 Figure 6.1 Historical SAR incidents within 10 nm of Hornsea Three array area .......................................... 16 Figure 6.2 MAIB incident locations by incident type within 10 nm of Hornsea Three array area ................. 17 Figure 6.3 RNLI incident locations by incident type within 10 nm of Hornsea Three array area .................. 18 Figure 7.1: GMDSS sea areas ..................................................................................................................... 24

  • Safety Justification for Single Line of Orientation Layout March 2019

    1

    1. Introduction

    Background

    Guidance provided in the Maritime and Coastguard Agency’s (MCA) Marine Guidance Note

    (MGN) 543 states ‘Developers should plan for at least two lines of orientation unless they can

    clearly demonstrate that fewer is acceptable’. Using this guidance as a basis, the Applicant has

    been assessing layouts and layout strategies for over two years as part of the Environmental

    Impact Assessment (EIA) process. Following the Preliminary Environmental Impact Assessment

    (PEIR) and responses received as part of the Section 42 consultation, the Applicant moved, in

    consultation with the MCA and Trinity House (TH), to firstly develop a set of Layout Development

    Principles to provide a framework for post consent